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pot ferricyanide is a bright red salt that appears yellow-green in water and is created by passing chlorine through a solution of potassium ferrocyanide. It is also commonly used as an ACS grade reagent.
Potassium ferricyanide is a mild oxidizing agent, and is often used in laboratory chemistry experiments. It is also an important ingredient in amperometric biosensors.
A number of photographic processes involve the use of potassium ferricyanide as a toner. It is widely available as a commercial reagent at most photography raw chemical suppliers, and can be purchased in large quantities on a special order basis.
Some metallography applications also utilize this reagent. It is often mixed with sodium hydroxide and water to form Murakami’s etchant, which can provide contrast between binder and carbide phases in cemented carbides.
It is also an important reducing agent in many biological experiments. It is one of the two compounds that turn blue (Prussian blue) in the presence of Fe2+ ions, and can therefore be used to measure metal oxidation in physiology experiments.
Several redox titrations are made with it, including the one where potassium permanganate is measured by oxidizing reduced cytochrome c in isolated mitochondria. In this experiment, it is a more convenient reagent than sodium dithionite, which is also used as an oxidizing agent.
The compound is also used in Jacobson synthesis of benzothiazoles (Scheme 95). It is a useful reagent for oxidative cyclization of arylthioamides in the ortho-position, a reductive reaction that proceeds by oxidation of an aryl halide to a bromophenol containing an amide group with a hydroxyl radical.